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  2. NGC 7662 - Wikipedia

    en.wikipedia.org/wiki/NGC_7662

    It is known as the Blue Snowball Nebula, Snowball Nebula, and Caldwell 22. This nebula was discovered October 6, 1784 by the German-born English astronomer William Herschel . In the New General Catalogue it is described as a "magnificent planetary or annular nebula, very bright, pretty small in angular size , round, blue, variable nucleus".

  3. Caldwell catalogue - Wikipedia

    en.wikipedia.org/wiki/Caldwell_catalogue

    Blue Snowball: Planetary Nebula: 3.2 Andromeda: 9 C23 NGC 891: Silver Sliver Galaxy: Spiral Galaxy: 31,000 Andromeda: 10 C24 NGC 1275: Perseus A: Supergiant Elliptical Galaxy: 230,000 Perseus: 11.6 C25 NGC 2419 Globular Cluster: 275 Lynx: 10.4 C26 NGC 4244 Spiral Galaxy: 10,000 Canes Venatici: 10.2 C27 NGC 6888: Crescent Nebula: Nebula: 4.7 ...

  4. NGC 6781 - Wikipedia

    en.wikipedia.org/wiki/NGC_6781

    NGC 6781, also known as the Snowglobe Nebula, [5] is a planetary nebula located in the equatorial constellation of Aquila, about 2.5° east-northeast of the 5th magnitude star 19 Aquilae. [3] It was discovered July 30, 1788 by the Anglo-German astronomer William Herschel. [6] The nebula lies at a distance of 1,500 ly from the Sun. [2]

  5. List of planetary nebulae - Wikipedia

    en.wikipedia.org/wiki/List_of_planetary_nebulae

    This page was last edited on 29 December 2024, at 03:24 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  6. Cosmic distance ladder - Wikipedia

    en.wikipedia.org/wiki/Cosmic_distance_ladder

    Radar is used to measure the distance between the orbits of the Earth and of a second body. From that measurement and the ratio of the two orbit sizes, the size of Earth's orbit is calculated. The Earth's orbit is known with an absolute precision of a few meters and a relative precision of a few parts in 100 billion (1 × 10 −11).

  7. Andromeda (constellation) - Wikipedia

    en.wikipedia.org/wiki/Andromeda_(constellation)

    Lying approximately 3 degrees southwest of Iota Andromedae at a distance of about 4,000 light-years from Earth, the "Blue Snowball Nebula" [11] is a popular target for amateur astronomers. [66] It earned its popular name because it appears as a faint, round, blue-green object in a telescope, with an overall magnitude of 9.2.

  8. Frost line (astrophysics) - Wikipedia

    en.wikipedia.org/wiki/Frost_line_(astrophysics)

    The actual temperature and distance for the snow line of water ice depend on the physical model used to calculate it and on the theoretical solar nebula model: this tells us nothing for the temperature in degrees 170 K at 2.7 AU (Hayashi, 1981) [4] 143 K at 3.2 AU to 150 K at 3 AU (Podolak and Zucker, 2010) [5] 3.1 AU (Martin and Livio, 2012) [6]

  9. East Town Street Historic District - Wikipedia

    en.wikipedia.org/wiki/East_Town_Street_Historic...

    The site was listed on the National Register of Historic Places in 1976 and the Columbus Register of Historic Properties in 1982; the district boundaries differ between the two entries. [ 1 ] [ 2 ] The Snowden-Gray House , a High Victorian -style two-and-a-half-story mansion with a cupola , built in 1852, is salient in the district.

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